Settings Tab, bottom center, check Extended Frequencies box.
Each new file will need to be rechecked prior to uploading.
Edit: Your request was for tables, not freqs.
The Help file has a good explanation which includes a dialog example.
Edit again:
I just now used Web import and it reported each of the offset and spacing to be in reverse. Click ok on each of these error reports and then select your freq and ID's to import and Win96 will properly corrected the errors.